Fabrication of an ultra-stable composite electrode material of La2O3/Co3O4/graphene on nickel foam for high-performance supercapacitors. (28th March 2022)

• Record Type: Journal Article
• Authors: Wang, Zijing; Lu, Shixiang; Xu, Wenguo; Wang, Ziwen; Zuo, Hao
• Is Part Of: New journal of chemistry. Volume 46:Number 15(2022)
• Page Start: 7202
• Page End: 7211
• Publication Date: 2022-03-28
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj00089j
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : A three-dimensional lily-like structure was constructed by the novel combination of La2 O3, Co3 O4, and graphene on nickel foam (LCGN) through hydrothermal synthesis and thermal annealing. Abstract : Stable electrode materials with suitable electrochemical performance and high specific power are essential for the application of supercapacitors. A combination of La2 O3, Co3 O4, and graphene on nickel foam (LCGN) was prepared by hydrothermal synthesis and heat treatment to construct a three-dimensional flower-like structure. The synergistic effect between La2 O3, Co3 O4, and graphene dramatically improves the electrode stability. Owing to the special three-dimensional flower-like structure that improves ion diffusion and prevents structural collapse during charging and discharging, the prepared LCGN composite exhibits an excellent specific capacitance of 2945.11 F g −1 (2.95 F cm −2 ) at a current density of 1 A g −1 and excellent rate retention of 79.20% at 30 A g −1 . Moreover, the LCGN//LCGN symmetric supercapacitor shows excellent performance with a specific capacitance of 403.92 F g −1 at 1 A g −1, with power density and energy density (12 000 W kg −1 at 53.9 W h kg −1 ), reflecting its industrial potential. Under the condition of 10 A g −1 current density, the capacitance retention rate is still extremely high, 89.3% after 30 000 continuous charge and discharge cycles, which certifies the promising potential of LCGN for high-performance energy storage devices.